Acta Adriatica, Vol. 53 No. 3, 2012.
Izvorni znanstveni članak
Comparisons of two research vessels’ properties in the acoustic surveys of small pelagic fish
Iole LEONORI
; Institut znanosti o moru (ISMAR-CNR), Largo Fiera della Pesca, 60125 Ancona, Italija
Vjekoslav TIČINA
orcid.org/0000-0002-3686-9563
; Institut za oceanografiju i ribarstvo (IOR), Šet. I. Meštrovića 63, 21000 Split, Hrvatska
Andrea DE FELICE
; Institut znanosti o moru (ISMAR-CNR), Largo Fiera della Pesca, 60125 Ancona, Italija
Olja VIDJAK
; Institut za oceanografiju i ribarstvo (IOR), Šet. I. Meštrovića 63, 21000 Split, Hrvatska
Leon GRUBIŠIĆ
; Institut za oceanografiju i ribarstvo (IOR), Šet. I. Meštrovića 63, 21000 Split, Hrvatska
Armin PALLAORO
; Institut za oceanografiju i ribarstvo (IOR), Šet. I. Meštrovića 63, 21000 Split, Hrvatska
Sažetak
Acoustic surveys in the Adriatic Sea have been performed annually by the research vessels “Dallaporta” and “Bios”, equipped with SIMRAD echo-sounders (EK-500 and EK-60), and working with 38 kHz split-beam transducer (ES38B). Since the vessels have different characteristics and use different pelagic trawls for fish sampling, there is uncertainty regarding the comparability of the results obtained. In order to evaluate comparability of the results, a comparison between research vessels was performed. That included comparisons of vessels’ noise, acoustic data collection, and fish samples composition and size structure analyses. The noise generated by both vessels was sufficiently low to allow a single fish detection up to 200 m depth. Acoustic data collected by the two vessels showed similar trends, no significant differences in average SA-values, and highly significant correlation between SA-values. Therefore, unbiased acoustic data collected by vessels could be combined in future stock assessments. Concerning collection of fish samples, anchovy resulted as the most abundant species in the samples collected by both vessels even if size compositions of anchovy were significantly different.
Ključne riječi
Echo surveys; research vessels; acoustic properties; data acquisition; Adriatic Sea
Hrčak ID:
97272
URI
Datum izdavanja:
30.12.2012.
Posjeta: 2.079 *